If the supply curve of labour market is given as S = 4L + 8. What is L when s = 20?

To find the value of L when the supply (s) is equal to 20, we can use the given supply curve equation: S = 4L + 8.
The supply curve equation represents how much labor (L) will be supplied at a given wage rate (s). In this case, the equation tells us that the supply of labor is equal to 4 times the quantity of labor (L) plus 8.
To find L when s = 20, let's substitute s = 20 into the equation:
20 = 4L + 8
Next, let's isolate L by subtracting 8 from both sides of the equation:
20 - 8 = 4L
Simplifying further:
12 = 4L
Now, we need to solve for L. We can do this by dividing both sides of the equation by 4:
12/4 = 4L/4
Simplifying again:
3 = L
Therefore, when the supply (s) is equal to 20, the value of L is 3.
So the correct answer is 3.